Rights statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/10.1021/acsphotonics.7b00687
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Research output: Contribution to Journal/Magazine › Letter › peer-review
Research output: Contribution to Journal/Magazine › Letter › peer-review
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TY - JOUR
T1 - Terahertz Nanoscopy of Plasmonic Resonances with a Quantum Cascade Laser
AU - Degl'Innocenti, Riccardo
AU - Wallis, Robert
AU - Wei, Binbin
AU - Xiao, Long
AU - Kindness, Stephen J.
AU - Mitrofanov, Oleg
AU - Braeuninger-Weimer, Philipp
AU - Hofmann, Stephan
AU - Beere, Harvey E.
AU - Ritchie, David A.
N1 - This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/10.1021/acsphotonics.7b00687
PY - 2017/9/20
Y1 - 2017/9/20
N2 - We present a terahertz (THz) scattering near-field optical microscope (s-SNOM) based on a quantum cascade laser implemented as both source and detector in a self-mixing scheme utilizing resonant quartz tuning forks as a sensitive nanopositioning element. The homemade s-SNOM, based on a resonant tuning fork and metallic tip, operates in tapping mode with a spatial resolution of ?78 nm. The quantum cascade laser is realized from a bound-to-continuum active region design with a central emission of ?2.85 THz, which has been lens-coupled in order to maximize the feedback into the laser cavity. Accordingly, the spatial resolution corresponds to >?/1000. The s-SNOM has been used to investigate a bidimensional plasmonic photonic crystal and to observe the optical resonant modes supported by coupled plasmonic planar antennas, showing remarkable agreement with the theoretical predictions. The compactness, unique sensitivity, and fast acquisition capability of this approach make the proposed s-SNOM a unique tool for solid-state investigations and biomedical imaging.
AB - We present a terahertz (THz) scattering near-field optical microscope (s-SNOM) based on a quantum cascade laser implemented as both source and detector in a self-mixing scheme utilizing resonant quartz tuning forks as a sensitive nanopositioning element. The homemade s-SNOM, based on a resonant tuning fork and metallic tip, operates in tapping mode with a spatial resolution of ?78 nm. The quantum cascade laser is realized from a bound-to-continuum active region design with a central emission of ?2.85 THz, which has been lens-coupled in order to maximize the feedback into the laser cavity. Accordingly, the spatial resolution corresponds to >?/1000. The s-SNOM has been used to investigate a bidimensional plasmonic photonic crystal and to observe the optical resonant modes supported by coupled plasmonic planar antennas, showing remarkable agreement with the theoretical predictions. The compactness, unique sensitivity, and fast acquisition capability of this approach make the proposed s-SNOM a unique tool for solid-state investigations and biomedical imaging.
KW - near-field microscopy
KW - photonic crystals
KW - plasmonics
KW - quantum cascade laser
KW - self-mixing detection
KW - terahertz
U2 - 10.1021/acsphotonics.7b00687
DO - 10.1021/acsphotonics.7b00687
M3 - Letter
AN - SCOPUS:85029687995
VL - 4
SP - 2150
EP - 2157
JO - ACS Photonics
JF - ACS Photonics
SN - 2330-4022
IS - 9
ER -